<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>购物车</caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="isall" />
            <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <gwc
          v-for="(val, index) in goodList"
          :key="index"
          :arr="val"
          :idx="index"
          @btnjia="btnjia"
          @btnjian="btnjian"
          @del="del"
          @isall="allfn"
        ></gwc>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{sum}}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import gwc from "./components/gouwuche";
export default {
  components: {
    gwc,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods: {
    btnjia(index) {
      this.goodList[index].num++;
    },
    btnjian(index) {
      this.goodList[index].num > 0 && this.goodList[index].num--;
    },
    del(index) {
      this.goodList.splice(index, 1);
    },
    allfn() {
      this.goodList.forEach((obj) => (obj.checked = true));
    },
  },
  computed: {
    isall: {
      set(val) {
        this.goodList.forEach((obj) => {
          obj.checked = val;
        });
      },
      get() {
        return this.goodList.every((obj) => obj.checked);
      },
    },
    sum() {
      return this.goodList
        .filter((i) => i.checked)
        .reduce((s, n) => s + n.price, 0);
    },
  },
};
</script>

<style>
</style>